...without sounding judgemental?

I made a comment to my coworker about how it gets difficult putting LO in her car seat bc she is rear facing, and she asked, "why is she still rear facing?" I am sure she asked that since her grandson is similar in age but f-faced a long time ago. I mumbled something bc I wasn't sure if "we're a bit paranoid about safety" would come off badly?

I honestly don't care whether people forward face as soon as possible, but I don't know how to explain my reasons without sounding like "that mom!"